| subacid | (adjective) slightly sour to the taste | - |
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| subacute | (adjective) less than acute; relating to a disease present in a person with no symptoms of it | - |
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| subalpine | (adjective) growing at high altitudes | Synonyms: alpestrine |
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| subaltern | (adjective) inferior in rank or status | Synonyms: junior-grade, lower-ranking, lowly, petty, secondary |
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| subaquatic | (adjective) partially aquatic; living or growing partly on land and partly in water | Synonyms: semiaquatic |
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| (adjective) growing or remaining under water | Synonyms: subaqueous, submerged, submersed, underwater |
| subaqueous | (adjective) growing or remaining under water | Synonyms: subaquatic, submerged, submersed, underwater |
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| subarctic | (adjective) of or relating to latitudes just south of the Arctic Circle | - |
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| subartesian | (adjective) (of water) rising naturally in a well to a height appreciably above that of the surrounding water table but not flowing out of the well | - |
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| subatomic | (adjective) of or relating to constituents of the atom or forces within the atom | - |
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| (adjective) of smaller than atomic dimensions | - |
| subclavian | (adjective) situated beneath the clavicle | - |
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| subclinical | (adjective) relating to the stage in the development of a disease before the symptoms are observed | - |
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| subconscious | (adjective) just below the level of consciousness | - |
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| subcortical | (adjective) of or relating to or being or involving nerve centers below the cerebral cortex | - |
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| subcutaneous | (adjective) relating to or located below the epidermis | Synonyms: hypodermic |
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| subduable | (adjective) susceptible to being subjugated | Synonyms: subjugable |
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| subdued | (adjective) lacking in light; not bright or harsh | Synonyms: dim |
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| (adjective) not brilliant or glaring | Synonyms: soft |
| (adjective) restrained in style or quality | Synonyms: low-key, low-keyed |
| (adjective) in a softened tone | Synonyms: hushed, muted, quiet |
| (adjective) quieted and brought under control | - |
| subdural | (adjective) below the dura mater but above the arachnoid membrane of the meninges | - |
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| subfusc | (adjective) devoid of brightness or appeal | - |
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| subgross | (adjective) too small to be visible to the naked eye | - |
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| subhuman | (adjective) less than human or not worthy of a human being | - |
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| (adjective) unfit for human beings | - |
| subjacent | (adjective) lying nearby but lower | - |
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| subject | (adjective) likely to be affected by something | - |
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| (adjective) being under the power or sovereignty of another or others | Synonyms: dependent |
| (adjective) possibly accepting or permitting | Synonyms: capable, open |
| subjective | (adjective) taking place within the mind and modified by individual bias | - |
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| (adjective) of a mental act performed entirely within the mind | Synonyms: immanent |
| subjugable | (adjective) susceptible to being subjugated | Synonyms: subduable |
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| subjugated | (adjective) reduced to submission | - |
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| subjunctive | (adjective) relating to a mood of verbs | - |
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| sublimate | (adjective) made pure | - |
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| sublimated | (adjective) passing or having passed from the solid to the gaseous state (or vice versa) without becoming liquid | Synonyms: sublimed |
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| sublime | (adjective) lifted up or set high | - |
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| (adjective) inspiring awe | Synonyms: empyreal, empyrean |
| (adjective) greatest or maximal in degree; extreme | Synonyms: supreme |
| (adjective) of high moral or intellectual value; elevated in nature or style | Synonyms: elevated, exalted, grand, high-flown, high-minded, idealistic, lofty, noble-minded, rarefied, rarified |
| (adjective) worthy of adoration or reverence | Synonyms: reverend |
| sublimed | (adjective) passing or having passed from the solid to the gaseous state (or vice versa) without becoming liquid | Synonyms: sublimated |
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| subliminal | (adjective) below the threshold of conscious perception | - |
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| sublingual | (adjective) beneath the tongue | - |
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| subliterary | (adjective) not written as or intended to be literature | - |
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| sublittoral | (adjective) of or relating to the region of the continental shelf (between the seashore and the edge of the continental shelf) or the marine organisms situated there | - |
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| sublunar | (adjective) situated between the earth and the moon | Synonyms: cislunar, sublunary |
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| (adjective) of this earth | Synonyms: sublunary, terrestrial |
| sublunary | (adjective) situated between the earth and the moon | Synonyms: cislunar, sublunar |
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| (adjective) of this earth | Synonyms: sublunar, terrestrial |
| submarine | (adjective) beneath the surface of the sea | Synonyms: undersea |
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| submerged | (adjective) beneath the surface of the water | Synonyms: submersed, underwater |
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| (adjective) growing or remaining under water | Synonyms: subaquatic, subaqueous, submersed, underwater |
| submergible | (adjective) capable of being immersed in water or functioning while submerged | Synonyms: submersible |
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| submersed | (adjective) beneath the surface of the water | Synonyms: submerged, underwater |
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| (adjective) growing or remaining under water | Synonyms: subaquatic, subaqueous, submerged, underwater |
| submersible | (adjective) capable of being immersed in water or functioning while submerged | Synonyms: submergible |
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| submissive | (adjective) inclined or willing to submit to orders or wishes of others or showing such inclination | - |
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| (adjective) abjectly submissive; characteristic of a slave or servant | Synonyms: slavish, subservient |
| subnormal | (adjective) below normal or average | - |
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| subocean | (adjective) formed or situated or occurring beneath the ocean or the ocean bed | Synonyms: suboceanic |
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| suboceanic | (adjective) formed or situated or occurring beneath the ocean or the ocean bed | Synonyms: subocean |
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| subocular | (adjective) situated on or below the floor of the eye socket | Synonyms: suborbital |
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| suborbital | (adjective) having or involving a trajectory of less than one orbit | - |
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| (adjective) situated on or below the floor of the eye socket | Synonyms: subocular |
| subordinate | (adjective) lower in rank or importance | Synonyms: low-level |
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| (adjective) subject or submissive to authority or the control of another | - |
| (adjective) (of a clause) unable to stand alone syntactically as a complete sentence | Synonyms: dependent |
| subordinating | (adjective) serving to connect a subordinate clause to a main clause | Synonyms: subordinative |
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| subordinative | (adjective) serving to connect a subordinate clause to a main clause | Synonyms: subordinating |
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| subscribed | (adjective) (of a contract or will or other document) having a signature written at the end | - |
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| subscript | (adjective) written or printed below and to one side of another character | Synonyms: inferior |
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| subsequent | (adjective) following in time or order | - |
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| subservient | (adjective) serving or acting as a means or aid | Synonyms: implemental, instrumental |
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| (adjective) abjectly submissive; characteristic of a slave or servant | Synonyms: slavish, submissive |
| (adjective) compliant and obedient to authority | - |
| subsidiary | (adjective) functioning in a supporting capacity | Synonyms: auxiliary, supplemental, supplementary |
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| subsidised | (adjective) having partial financial support from public funds | Synonyms: subsidized |
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| subsidized | (adjective) having partial financial support from public funds | Synonyms: subsidised |
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| subsonic | (adjective) (of speed) less than that of sound in a designated medium | - |
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| substandard | (adjective) falling short of some prescribed norm | Synonyms: deficient, inferior |
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| substantial | (adjective) having substance or capable of being treated as fact; not imaginary | Synonyms: material, real |
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| (adjective) of considerable importance, size, or worth | Synonyms: significant |
| (adjective) of or relating to the real nature or essential elements of something | Synonyms: substantive |
| (adjective) having an abundant supply of money or possessions of value | Synonyms: affluent, flush, loaded, moneyed, wealthy |
| (adjective) of good quality and condition; solidly built | Synonyms: solid, strong |
| (adjective) providing abundant nourishment | Synonyms: hearty, satisfying, solid, square |
| substantiating | (adjective) serving to support or corroborate | Synonyms: collateral, confirmative, confirmatory, confirming, corroborative, corroboratory, substantiative, validating, validatory, verificatory, verifying |
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| substantiative | (adjective) serving to support or corroborate | Synonyms: collateral, confirmative, confirmatory, confirming, corroborative, corroboratory, substantiating, validating, validatory, verificatory, verifying |
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| substantival | (adjective) of or relating to or having the nature or function of a substantive (i.e. a noun or noun equivalent) | - |
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| substantive | (adjective) defining rights and duties as opposed to giving the rules by which rights and duties are established | Synonyms: essential |
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| (adjective) of or relating to the real nature or essential elements of something | Synonyms: substantial |
| (adjective) being on topic and prompting thought | Synonyms: meaty |
| substitutable | (adjective) capable of being exchanged for another or for something else that is equivalent | Synonyms: commutable |
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| (adjective) (of words) interchangeable in a given context without changing the import of the expression | - |
| substitute | (adjective) artificial and inferior | Synonyms: ersatz |
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| (adjective) serving or used in place of another | Synonyms: alternate, alternative |
| (adjective) capable of substituting in any of several positions on a team | Synonyms: utility |
| subsurface | (adjective) beneath the surface | - |
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| subterminal | (adjective) near but not precisely at an end | - |
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| subterranean | (adjective) lying beyond what is openly revealed or avowed (especially being kept in the background or deliberately concealed) | Synonyms: subterraneous, ulterior |
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| (adjective) being or operating under the surface of the earth | Synonyms: subterraneous |
| subterraneous | (adjective) lying beyond what is openly revealed or avowed (especially being kept in the background or deliberately concealed) | Synonyms: subterranean, ulterior |
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| (adjective) being or operating under the surface of the earth | Synonyms: subterranean |
| subtle | (adjective) working or spreading in a hidden and usually injurious way | Synonyms: insidious, pernicious |
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| (adjective) difficult to detect or grasp by the mind or analyze | Synonyms: elusive |
| (adjective) able to make fine distinctions | - |
| subtractive | (adjective) constituting or involving subtraction | - |
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| subtropic | (adjective) of or relating to or characteristic of conditions in the subtropics | Synonyms: semitropic, semitropical, subtropical |
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| subtropical | (adjective) of or relating to or characteristic of conditions in the subtropics | Synonyms: semitropic, semitropical, subtropic |
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| suburban | (adjective) relating to or characteristic of or situated in suburbs | - |
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| suburbanised | (adjective) surrounded by many suburbs | Synonyms: suburbanized |
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| suburbanized | (adjective) surrounded by many suburbs | Synonyms: suburbanised |
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| subversive | (adjective) in opposition to a civil authority or government | Synonyms: insurgent, seditious |
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